What: /sys/bus/typec/devices/.../displayport/configuration
Date: July 2018
Contact: Heikki Krogerus <[email protected]>
Description:
Shows the current DisplayPort configuration for the connector.
Valid values are USB, source and sink. Source means DisplayPort
source, and sink means DisplayPort sink.
All supported configurations are listed as space separated list
with the active one wrapped in square brackets.
Source example:
USB [source] sink
The configuration can be changed by writing to the file
Note. USB configuration does not equal to Exit Mode. It is
separate configuration defined in VESA DisplayPort Alt Mode on
USB Type-C Standard. Functionally it equals to the situation
where the mode has been exited (to exit the mode, see
Documentation/ABI/testing/sysfs-bus-typec, and use file
/sys/bus/typec/devices/.../active).
What: /sys/bus/typec/devices/.../displayport/pin_assignment
Date: July 2018
Contact: Heikki Krogerus <[email protected]>
Description:
VESA DisplayPort Alt Mode on USB Type-C Standard defines six
different pin assignments for USB Type-C connector that are
labeled A, B, C, D, E, and F. The supported pin assignments are
listed as space separated list with the active one wrapped in
square brackets.
Example:
C [D]
Pin assignment can be changed by writing to the file. It is
possible to set pin assignment before configuration has been
set, but the assignment will not be active before the
connector is actually configured.
Note. As of VESA DisplayPort Alt Mode on USB Type-C Standard
version 1.0b, pin assignments A, B, and F are deprecated. Only
pin assignment D can now carry simultaneously one channel of
USB SuperSpeed protocol. From user perspective pin assignments C
and E are equal, where all channels on the connector are used
for carrying DisplayPort protocol (allowing higher resolutions).
What: /sys/bus/typec/devices/.../displayport/hpd
Date: Dec 2022
Contact: Badhri Jagan Sridharan <[email protected]>
Description:
VESA DisplayPort Alt Mode on USB Type-C Standard defines how
HotPlugDetect(HPD) shall be supported on the USB-C connector when
operating in DisplayPort Alt Mode. This is a read only node which
reflects the current state of HPD.
Valid values:
- 1: when HPD’s logical state is high (HPD_High) as defined
by VESA DisplayPort Alt Mode on USB Type-C Standard.
- 0 when HPD’s logical state is low (HPD_Low) as defined by
VESA DisplayPort Alt Mode on USB Type-C Standard.
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